dns-vs-14.dns.cldin.net has no MX records.
Question and response
Question
dig dns-vs-14.dns.cldin.net. MX
Answer
The response has no answer records.
Authority
dns.cldin.net. 3600 SOA ns3.cldin.eu. hostmaster.dns.cldin.net. 1772759033 3600 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0